Dore w



(No Model.)

L B. MOREAU.

HAND ROCK DRILL.

Patented Jan. 2, 1883;

Inventor u PETERS. Phdloudwgnplur. Wuhinflpn, a a

front of the machine.

UNITED STATE-S EUGENE MOREAU,

PATENT OFFICE.

OF SAN FRANCISCO, CALIFORNIA, nsslenon To Tune DORE w. srnnnme, oFsAME PLACE.

HAND ROCK-DRILL."

SPECIFICATION forming part of Letters Patent No. 269,952, dated- January 2, 1883,

' Application filed January 28, 1882. (No model.)

To all whom it may concern Be it known that LEUGENE .MOREAU, of the city and county of San Francisco, State of California, have invented an Improvement in Hand Rock-Drills; and I hereby declare the following to be a full, clear, and exact dc scriptiom thereof.

My invention relates to improvements in hand rock-drills; and it consists in the combito nation and arrangement ofparts, substantially as-hereinafter more fully set forth and claimed. Referring to the accompanying drawings, Figure 1 is a side elevation and section of the machine. Fig. 2 is a top view of same. Fig. 1 3 is across-section, and Fig. 4 is a front elevation.

A is a bed-plate, in which are out the longitudinal grooves a a.

B is the frame of the machine, and slides in the grooves a a.

The screw 0, provided with the hand-wheel D, turns freely in the bearings b b at the ends of plate A. The screw O'passes through the nut E, cast on the frame B, so that by turning the hand-wheel D the machine ismade to go forward or back in the guides or grooves a, as desired.

A shaft, F, rests in the bearings made for it at the ends of the frame B. On the shaft F is 0 fastened the crank-wheel G and the two disks H and I. The disk'H is provided with holes equidistant from each other and also from axis of shaft F, Fig. 3. Grooves'e are cut opposite each hole at the periphery of disk H. Holes are also drilled into the disk I, corresponding in position to those of disk H, but of a smaller diameter.

J are steel pieces, made to fit the holes in the disks H I. The part fitted in H is called the 40 hammerand the part fitted inIis called the stem. Spiral springs K are placed on the stems between the shoulderofthe hammer and e the disk I to press the hammer'toward the On each hammer are 5 fitted two friction-rollers, one of which, L, bears against the cam M and the other, N, fits into the grooves e at the periphery'ofthedisk V H, thus allowing the hammer to move backward and forward, but preventingits rotation the front part of the machine.

I on its own axis. The cam M is a cylinder, (the shaft F passing through its center,)'and is fastened to the inner side of the front end of'frame B. Its edge, against which the rollers L are pressed, iscut in the shape of a screw, so that v when a movement-of rotation is imparted to 5 the shaft F and the hammers each hammer will be pressed back until it has come opposite the upper part of the machine, when it is relieved from the cam, which allows it to go suddenly forward under the action of'the spring K, and strike the spindle O. The spindle O is fitted into a bearing made to receive it at The inner end of O is of larger diameter than the body, and at the other end is fitted a block, 0, made to 6 receive and hold the drill.

P is a gear fitted loosely through a recess in the frame upon the spindle 0, said spindle 0 being provided with a spline, in which fits a corresponding feather riveted to gear P, thus 73' providingfor the forward and backward movement of the spindle while still causing it to revolve with said gear.

At the forward end of shaft F is keyed a pinion, Q, engaging the gear P. The pinion 75 Q and gear P may preferably have their numbers of teeth in proportion of one to two.

When the shaft F is made to revolve by means of crank it of wheel Gthe hammer J,

passing through, the disks .H 1' upon said shaft are revolved and are pressed back against the springs K by thecaiuM, against which their rollers L impinge, so that each one in its turn will come opposite and strike the spindle 0. At the same time the pinion Q causes the gearP, and consequently the spindle O, to revolve. This causes the rotation of the drill. By this construction I obtain a steady rotation, combined with the blows upon the drill, and

thus keep the point constantly cutting into 0 the rock. A high rate of speed may be obtained, as the hammers may be brought into position rapidly and the blows delivered upon the continuously-revolving drill. When the point of the'drill is made to bear against the 5 rock the combined efiect of the blows and the. rotation of the drill causes the latter to perforate the rock. The point of the drill is kept mers, shaft F and wheel G, drill-holding spinin contact with the rock as it progresses by means of the hand-wheel D, screw 0, and nut E, the bed-plate A having been previously placed and fastened in its proper position.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a hand rock-drill having a frame,B, and a drill and drill-holding spindle O, the combination and arrangement of the series of hammers J with their rollers L N and operatingsprings K, the disks H I, driving-shaft F, with its crank-wheel, Gr, and cam M, substantially as and for-the purpose herein described.

2. The bed-plate A, frame B, adjustable thereon by means of screw 0 and nut E, hammers J, rollers L N on the shafts of said hammers, springs K, disks H I, carrying the hamdle, with its drill, the feathered gear 1, pinion Q, and the cam M, operating to retract the hammers, all in combination, substantially as and for the purpose set forth.

3. In a hand rock-drill, the drill-holding! spindle O, in combination with the revolving l power-shaft F, a series of parallel hammers connected with and revolved by said shaft to bring each hammer successively in line with the drill-holding spindles, a mechanism for discharging each hammer thereon when in line, and a mechanism connected with the powershaft F, and the drill-holding spindle for imparting a continuous revolution to said drillholding spindle, substantially as and for the purpose hereinidesoribed.

4. In a' hand rock-drill, the drill-holding spindle O, and the means for imparting continuous revolution to it, consisting ofthe feathered ratchet P, pinion Q, and power-shalt F, in combination with the series of parallel bammers J, connected with and revolved by the power-shaft F, and a mechanism for discharg ing'eaeh hammer as it is brought in line with the drill-holding spindle, all arranged and operating substantially as herein set forth.

In witness whereof I hereunto set mv band. a EUGENE MOREAU.

WVitnesses: FRANK A. BRooKs,

S. H. NoURsEJ 

